全文获取类型
收费全文 | 622篇 |
免费 | 19篇 |
国内免费 | 56篇 |
专业分类
化学 | 333篇 |
晶体学 | 21篇 |
力学 | 21篇 |
综合类 | 1篇 |
数学 | 36篇 |
物理学 | 285篇 |
出版年
2022年 | 15篇 |
2021年 | 6篇 |
2020年 | 17篇 |
2019年 | 15篇 |
2018年 | 22篇 |
2017年 | 16篇 |
2016年 | 11篇 |
2015年 | 4篇 |
2014年 | 11篇 |
2013年 | 29篇 |
2012年 | 26篇 |
2011年 | 35篇 |
2010年 | 29篇 |
2009年 | 27篇 |
2008年 | 34篇 |
2007年 | 31篇 |
2006年 | 30篇 |
2005年 | 25篇 |
2004年 | 24篇 |
2003年 | 21篇 |
2002年 | 25篇 |
2001年 | 18篇 |
2000年 | 18篇 |
1999年 | 6篇 |
1998年 | 10篇 |
1997年 | 6篇 |
1996年 | 11篇 |
1995年 | 10篇 |
1994年 | 4篇 |
1993年 | 8篇 |
1992年 | 4篇 |
1991年 | 9篇 |
1990年 | 6篇 |
1989年 | 6篇 |
1988年 | 14篇 |
1987年 | 4篇 |
1986年 | 13篇 |
1985年 | 8篇 |
1984年 | 5篇 |
1983年 | 6篇 |
1981年 | 4篇 |
1980年 | 5篇 |
1979年 | 7篇 |
1978年 | 5篇 |
1977年 | 5篇 |
1976年 | 10篇 |
1973年 | 10篇 |
1972年 | 5篇 |
1969年 | 6篇 |
1968年 | 5篇 |
排序方式: 共有697条查询结果,搜索用时 15 毫秒
81.
82.
Arnaldi R Banicz K Castor J Chaurand B Cicalò C Colla A Cortese P Damjanovic S David A de Falco A Devaux A Ducroux L En'yo H Fargeix J Ferretti A Floris M Förster A Force P Guettet N Guichard A Gulkanian H Heuser JM Keil M Kluberg L Lourenço C Lozano J Manso F Martins P Masoni A Neves A Ohnishi H Oppedisano C Parracho P Pillot P Poghosyan T Puddu G Radermacher E Ramalhete P Rosinsky P Scomparin E Seixas J Serci S Shahoyan R Sonderegger P Specht HJ Tieulent R Usai G Veenhof R 《Physical review letters》2007,99(13):132302
The NA60 experiment studies muon pair production at the CERN Super Proton Synchrotron. In this Letter we report on a precision measurement of J/psi in In-In collisions. We have studied the J/psi centrality distribution, and we have compared it with the one expected if absorption in cold nuclear matter were the only active suppression mechanism. For collisions involving more than approximately 80 participant nucleons, we find that an extra suppression is present. This result is in qualitative agreement with previous Pb-Pb measurements by the NA50 experiment, but no theoretical explanation is presently able to coherently describe both results. 相似文献
83.
V. G. Bazhenov S. V. Zefirov V. L. Kotov 《Journal of Applied Mechanics and Technical Physics》2004,45(5):732-740
This paper considers an experimental–theoretical technique for determining pressure–strain curves and curves of yield strength versus pressure for soils based on disagreement between data of physical and numerical modeling of wave processes in a system of split Hopkinson bars with a soil sample in a holder. A convergent iterative procedure was developed to refine the equation-of-state parameters of soils obtained by the Kolsky method. The error of the technique is analyzed, the role of friction and the coefficient of sliding friction between the soil and the deformed holder. 相似文献
84.
Michaël Gabay Nadia Brauner Vladimir Kotov 《4OR: A Quarterly Journal of Operations Research》2017,15(2):183-199
We use game theory techniques to automatically compute improved lower bounds on the competitive ratio for the bin stretching problem. Using these techniques, we improve the best lower bound for this problem to 19/14. We explain the technique and show that it can be generalized to compute lower bounds for any online or semi-online packing or scheduling problem. 相似文献
85.
A. M. Bragov V. L. Kotov A. K. Lomunov I. V. Sergeichev 《Journal of Applied Mechanics and Technical Physics》2004,45(4):580-585
A modified Kolsky method for dynamic tests of soft soils in an elastic holder is analyzed. It is shown the axial and radial stresses in the sample are uniform. The rational geometry of the holder is determined. Friction is found to have an effect on the dynamic strain diagram obtained. It is suggested that this effect can be reduced by lubricating the inner surface of the holder. 相似文献
86.
87.
88.
89.
在水溶液条件下以六缺位的[H2P2W12O48)]12-和Eu髥为反应前躯体得到了1个新的多金属氧酸盐化合物[Eu3(H2O)17(α2-HP2W17O61)].5H2O(1),对其进行了元素分析、红外光谱、热重、荧光等表征,并用X-射线单晶衍射测定了它的晶体结构。化合物1含有双支撑的多阴离子簇[{Eu(H2O)7}2{Eu(H2O)3(α2-P2W17)}2]8-,并进一步通过Eu髥连接形成了延c轴方向的一维链。室温条件下的荧光光谱研究表明:化合物1显示了强的红光发射。 相似文献
90.
WANG Zhi-xin HOU Yi HAN Wei WANG Kai-chen GUO Bao-feng LIU Ying CHANG Xi-hua WANG Wei-hua NA Wan-li KONG Xiang-bo ZHAO Xu ZHANG Ling 《高等学校化学研究》2011,27(1):94-98
Renal cell carcinoma is the most common cancer of the kidney, and resistant to traditional therapies. The aim of this study is to investigate the effects of hydroxyapatite nanoparticles on human renal cell carcinoma 786-0 cells. Cell proliferation was assessed with an 3-(4,5-dimethylthiazol-2-yl) 2,5-diphenyltetrazolium bromide(MTT) staining kit. The apoptosis assay was assessed with an FITC Annexin V Apoptosis Detection Kit. Caspase-3 and caspase-12 were detected by immunocytochemical staining and semi-qua... 相似文献